The Night We Stopped the Flood — Peter Reynolds

When Jim and his friends Joe, Tom and Frank set off on their bikes for a weekend of camping and hiking they are looking forward to a good adventure. Little do they know that they will soon be having the adventure of their lives. Soon they are witness to a deadly German plot that threatens not only the four of them, but their families and hundreds of their neighbours as well. It's up to the four boys to prevent the disaster, and they will have to show bravery and cunning to get out of it unscathed. A ripping yarn that will thrill children and grown-ups alike.